Exam 7: Estimation

What is the effect on a confidence interval if one decreases both sample size and the level of confidence?

Ranges of values within which the population parameter may fall are called

Which of the following is true about the relationship between the population mean and the mean of the sampling distribution?

Because population parameters are typically unknown,we use the ______ to estimate the value of the standard error.

Sample size and the confidence level width have a(n)______ relationship.

To establish a confidence interval for a proportion,add or subtract from the mean the product of the standard error and the Z value corresponding to the confidence level.

In a survey sample of 1000 respondents,the mean annual salary is $32,245,with a standard deviation of 4021.54.Estimate the value of the standard error.

The radius of a confidence interval is called the

Widening the confidence interval from 95% to 99% increases the ______ but decreases the ______.

In a survey sample of 1000 respondents,the mean annual salary is $32,245,with a standard deviation of 4021.54.Calculate a 99% confidence interval for these data.

In a survey sample of 83 respondents,the mean number of hours worked per week is 39.04,with a standard deviation of 11.51.The sample size is 83.Estimate the value of the standard error.

What is the goal of most research?

Provide a hypothetical numerical example which demonstrates that the precision of a confidence interval is in part a function of sample size.

For which of the following statistic the confidence intervals are usually constructed?

Which two quantities are needed to estimate the standard error of the proportions toward the further estimation of confidence intervals for proportions?

A sample of 150 U.S.adults is composed of 100 women and 50 men.Estimate the standard error of the proportions for the female population.

Briefly describe how you would establish a confidence interval for a mean or proportion.

Assuming that a sample (N = 504)has a sample standard deviation of 2.26,what is the estimated standard error?

Provide a substantive interpretation of the following 99% confidence interval: (.25,.41).

A sample of 150 U.S.adults is composed of 100 women and 50 men.Estimate the standard error of the proportions for the male population.